/// <summary>
/// 获取验证码
/// </summary>
/// <returns></returns>
public ActionResult CreateVerifyCode()
{
string checkCode = RandomHelper.CreateImageCode();
TempData["verifyManageCode"] = checkCode;//将验证码随机数放入临时缓存
return(File(ImageHelper.CodeImage(checkCode), @"image/Gif"));
}